it fixes PR2204. Not too much to say about the implementation; it works
in a similar way to the vector size attribute.
At some point, we need to modify the targets to provide information
about the appropriate types.
llvm-svn: 51577
lib dir and move all the libraries into it. This follows the main
llvm tree, and allows the libraries to be built in parallel. The
top level now enforces that all the libs are built before Driver,
but we don't care what order the libs are built in. This speeds
up parallel builds, particularly incremental ones.
llvm-svn: 48402
